Intensification of heat transfer in a turbulent gas-droplet flow with peripheral swirling
M.A. Pakhomov, V.I. Terekhov
Kutateladze Institute of Thermophyhsics SB RAS, Novosibisrk, Russia
Keywords: gas-droplet flow, swirling, evaporation, numerical simulation, turbulence, Reynolds stress transport model
Abstract
The effect of peripheral flow swirling in a cylindrical channel on the local flow structure and heat transfer in a turbulent gas-droplet flow was numerically studied with variations in the initial mass concentration of water droplets in the range ML1 = 0 - 0.1 and the initial droplet diameter d1 = 10 - 100 μm. It is shown that adding droplets leads to a significant increase in heat transfer (more than 2.5 times) in comparison with a single-phase swirling flow. The heat transfer patterns in gas-droplet flows with and without swirling are qualitatively similar. The effect of heat transfer intensification due to gas-droplet flow swirling reaches 50% at ML1 = 0.1. Initially, with an increase in the droplet size, a significant intensification of heat transfer in the swirling flow occurs. The maximum heat transfer is obtained at d1 ≈ 50 μm for all swirling intensities of the two-phase flow. Then the value of heat transfer decreases and its dependence on the droplet size becomes more gradual.
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